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Concurrent coupling of atomistic simulation and mesoscopic hydrodynamics for flows over soft multi-functional surfaces

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c8sm02170h· OSTI ID:1613243
 [1];  [2];  [3];  [4];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Brown Univ., Providence, RI (United States); University of Chinese Academy of Sciences, Beijing (China); DOE/OSTI
  2. Brown Univ., Providence, RI (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)

Here, we develop an efficient parallel multiscale method that bridges the atomistic and mesoscale regimes, from nanometers to microns and beyond, via concurrent coupling of atomistic simulation and mesoscopic dynamics. In particular, we combine an all-atom molecular dynamics (MD) description for specific atomistic details in the vicinity of the functional surface with a dissipative particle dynamics (DPD) approach that captures mesoscopic hydrodynamics in the domain away from the functional surface. In order to achieve a seamless transition in dynamic properties we endow the MD simulation with a DPD thermostat, which is validated against experimental results by modeling water at different temperatures. We then validate the MD-DPD coupling method for transient Couette and Poiseuille flows, demonstrating that the concurrent MD-DPD coupling can resolve accurately the continuum-based analytical solutions. Subsequently, we simulate shear flows over grafted polydimethylsiloxane (PDMS) surfaces (polymer brushes) for various grafting densities, and investigate the slip flow as a function of the shear stress. We verify that a “universal” power law exists for the slip length, in agreement with published results. Having validated the MD-DPD coupling method, we simulate time-dependent flows past an endothelial glycocalyx layer (EGL) in a microchannel. Coupled simulation results elucidate the dynamics of the EGL changing from an equilibrium state to a compressed state under shear by aligning the molecular structures along the shear direction. MD-DPD simulation results agree well with results of a single MD simulation, but with the former more than two orders of magnitude faster than the latter for system sizes above one micron.

Research Organization:
Brown Univ., Providence, RI (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); National Institutes of Health (NIH); US Army Research Office (ARO); Chinese Scholarship Council (CSC)
Grant/Contract Number:
SC0019453
OSTI ID:
1613243
Alternate ID(s):
OSTI ID: 1710202
OSTI ID: 1491909
Journal Information:
Soft Matter, Journal Name: Soft Matter Journal Issue: 8 Vol. 15; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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